Abstract
This paper proposes a name service called namedirectory announcing the information of neighbors who arereachable in IPv6 mobile ad hoc network partition. Neighborinformation consists of ad hoc user profile, DNS name and IPv6address. Through name directory, ad hoc users can know whois reachable in the connected network partition and connect tothe user’s mobile node with host DNS name.
I. INTRODUCTION
Mobile Ad Hoc Network (MANET) consists of mobilenodes that take part in routing so as to communicate with oneanother in the environment where there is no communicationinfrastructure. Small Office Home Office (SOHO) networks,home-networks, and internal networks of transport vehiclessuch as airplane, train and bus can be constructed withMANET networking. Up to recently, MANET networking hasbeen researched mainly on ad hoc routing protocols. However,for the deployment of MANET networking, other services arenecessary, such as MANET IP address autoconfiguration andMANET DNS service [1]–[4].In this paper, we focus on name service including DNSservice in MANET, where the current dedicated DNS is impossibleto adopt in order to provide name service for mobilenodes. Because MANET has dynamic network topology, thecurrent DNS cannot be adopted in MANET, which has thehierarchical structure and consists of dedicated servers. NameDirectory (NDR) proposed in this paper not only providesDNS name service in multi-hop MANET, but also allowsad hoc user of mobile node to perceive the neighbors andtheir user information that is necessary to decide whetheror not the neighbor is the man with whom the user wantsto communicate. We also suggest an autoconfiguration (zeroconfiguration)technology for generating DNS zone file associatinghost DNS name with autoconfigured IPv6 address. Thenaming suggested in this paper is useful in ad hoc networkwhere there is no network manager to assign each user aunique domain name and there can exist mobile nodes withduplicate host DNS names. Accordingly, we suggest an AdHoc Name Service System (ANS) for MANET DNS and NDRservice in this paper: (a) Auto-generation of DNS zone file,(b) Name-to-address translation, and © Collection of userinformation of neighbor nodes.The remainder of the paper is organized as follows. InSection II, related work is presented. In Section III and IV,respectively, Multicast DNS and NDR are explained in detail.In Section V, we explain our testbed for testing NDR in IPv6MANET. Finally, in Section VI, we conclude the paper withfuture research work.
II. RELATED WORKA. MANET DNS
ServiceAn architecture of DNS service system is specified formobile ad hoc network which might be connected to theInternet [1], [3], [4]. The resolution of DNS names of mobilenodes within mobile ad hoc network is performed by multicastDNS and that of DNS names of nodes in the Internet isperformed through DNS autoconfiguration of recursive DNSserver. In the former, each mobile node plays a role ofDNS name server for the DNS resource records associatedwith DNS name of which authority it has. The latter allowsmobile node to receive the global Internet service, such asweb service, by providing global DNS resolution in mobilead hoc network connected to the Internet. These two kindsof DNS name resolution are processed automatically withoutthe intervention of users in mobile ad hoc network. Also, wecan authenticate DNS message on the basis of “Secret KeyTransaction Authentication for DNS” resource record calledTSIG resource record [1], [3]–[5].We can provide ad hoc userswith service discovery based on multicast DNS and “ServiceLocation” resource record called SRV resource record [4], [6].B. Multicast Ad Hoc On-Demand Distance Vector (MAODV)Multicast Ad Hoc On-Demand Distance Vector (MAODV)routing protocol is an extension of AODV routing protocolfor ad hoc multicast routing [7], [8]. MAODV is a shared treebased multicast routing protocol like PIM-SM [9]. When anew group member joins a multicast tree corresponding to amulticast group, it finds a shortest path to the tree throughAODV route discovery [7]. In every multicast tree, a groupleader is selected to broadcast a Group-Hello (GRPH) messagethroughout the whole network to indicate the existence of thatgroup and its current status. When receiving a GRPH message,each node updates its Group Leader Table which indicates thegroup leader and the route towards the group leader


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